[TW]Core/MeleeSpellHitResult: Shred & backstab

Fix error in commit 928c37e697b6a516f7d9eb2479503fd188f04885
also just return SPELL_MISS_NONE no need to go through below checks
[TW] Core/Spell: Primal Fury fix idea

- Maybe path to solution seems to work but is somewhat hard to test.
- Bug seems to come from players having both ranks of the talent within
the spell list and then remove or adding rank breaks primal fury(maybe).
TW hackfix Mystic Buffet

Fixes All you can eat achievement and some general problems at sindra
Merge pull request #33 from Unholychick/patch-1

[TW308] - hackfix Mystic Buffet
Core/Arena: PR/MMR rating change on leave

- Fixes issue if player was last participant in arena match and left
they would avoid rating loss
Merge pull request #32 from gecko32/TWpatch2

[TW]Core/MeleeSpellHitResult: Shred & backstab
Merge pull request #34 from gecko32/ArenaPatch

Core/Arena: PR/MMR rating change on leave
[TW307] - Core/Scripts: Should prevent Raging Spirits from engaging players inside Frostmourne

Thanks to yesitsme for the hint
[TW308] - Core/Scripts: Should prevent Vile Spirits from going inside Frostmourne
[TW309] - Core/Scripts: Some changes to previous commits thanks to gecko32
[TW309] - Core/Scripts: Some more attempts at making Raging Spirits do nothing during Frostmourne phase
[TW311] - Core/Scripts: Stop Vile Spirits at Harvest Soul cast, not after, thanks to gecko32
[TW312] - Core/Scripts: Last push on Raging Spirits
[TW313] - Core/Spells: Some corrections.. nothing important
[TW314] - Core/Scripts: Solve something with paletress